JPH052922U - Bearing member - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a tough, lightweight, inexpensive bearing member having a smooth sliding surface on which glass fibers are not exposed. [Composition] When a bearing member made of a thermoplastic resin containing glass fibers is injection-molded using a mold, the surface of the mold, which is in close contact with the sliding surface, is locally heated to a temperature not lower than the heat deformation temperature of the thermoplastic resin by high frequency induction heating. Put on heat.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing member such as a wiper arm housing having a sliding surface on which a load is applied.

[0002]

[Prior art and its problems]

 As shown in FIG. 2, the conventional wiper arm housing 1 is made of aluminum die-cast, and prevents the galling of the wiper arm 2 when the grease 3 filled in the gap between the housing 1 and the wiper arm 2 runs out. Therefore, since the bushes 4 made of polyacetal resin are arranged above and below the housing 1, there is a problem that the cost and weight increase. In order to deal with this, it was considered to mold the wiper arm housing 1 by injection molding a thermoplastic resin containing glass fiber in a mold, but the glass fiber exposed on the sliding surface causes the wiper arm 2 to be molded. There was a problem that galling occurred.

[0003]

[Means for Solving the Problems]

 According to the present invention, when a thermoplastic resin containing glass fibers is injection-molded, the mold surface is preheated to a temperature not lower than the heating deformation temperature of the thermoplastic resin by high frequency induction heating to improve the plasticity of the molded product surface. When injection-molded while held, a molded product formed by adhering to the mold surface does not contain glass fibers in the skin layer, and the surface is smooth and free of flow marks and silver streaks. It was devised based on the finding that it can be obtained, and the gist thereof is a bearing member molded by injection molding a thermoplastic resin containing glass fiber in a mold, A bearing member is characterized in that it has a sliding surface formed in close contact with the surface of a mold that has been locally heated to a temperature above the heating deformation temperature of the thermoplastic resin by high-frequency induction heating.

[0004]

【Example】

 One embodiment of the present invention is shown in FIG. The wiper arm housing 10 is formed by injection molding a thermoplastic resin such as polybutylene terephthalate containing glass fibers or polyacetal in a mold. The wiper arm housing 10 is provided with a sliding surface 11 for bearing the wiper arm, and the sliding surface 11 is preliminarily deformed by heating the thermoplastic resin by high-frequency induction heating on the surface of the mold closely contacting with the sliding surface 11 during injection molding. It can be obtained by locally heating above the temperature and injection-molding while maintaining the plasticity of the resin surface. Therefore, the glass fiber is not exposed on the surface of the sliding surface 11 thus formed, and flow marks, silver streaks, or the like do not appear.

[0005]

[Effect of the device]

 Since the bearing member of the present invention is made of thermoplastic resin, it is lightweight, and since it contains glass fiber, it has excellent tensile strength, bending strength, bending elastic modulus, and dimensional stability. Since the sliding surface of this bearing member is formed in close contact with the mold surface that has been locally heated to a temperature above the heating deformation temperature of the thermoplastic resin by high frequency induction heating, the glass fiber is exposed on the sliding surface. Moreover, since the sliding surface is smooth and flow marks and silver streaks do not appear, even if the sliding contact is made with the shaft, there is no galling on the shaft. Since this bearing member is molded at once by injection molding, it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional wiper arm housing.

[Explanation of symbols]

 10 Bearing member 11 Sliding surface

Claims (1)

[Claims for utility model registration] Claims: 1. A bearing member molded by injection-molding a thermoplastic resin containing glass fiber in a mold, wherein the thermoplastic resin is heated in advance by high-frequency induction heating. A bearing member comprising a sliding surface formed in close contact with a surface of a mold locally heated above a deformation temperature.